python - 您能否将加法赋值 ( += ) 运算符与海象运算符 ( := ) in Python? ) 结合使用

Question

这是我现在写的代码:

a = 1
if (a := a + 1) == 2:
  print(a)

我想知道是否存在这样的事情:

a = 1
if (a +:= 1) == 2:
  print(a)

Answer 1

PEP-527定义了新的海象运算符。 section讨论赋值语句和表达式之间的差异明确指出:

• Augmented assignment is not supported:

  total += tax  # Equivalent: (total := total + tax)
  

在 section解释原因 =仍然需要使用 := ， 我们发现:

The two forms have different flexibilities. The := operator can be used inside a larger expression; the = statement can be augmented to += and its friends, can be chained, and can assign to attributes and subscripts.

这强烈暗示无意支持任何类型的海象和就地运营商的合并。